eli5 if captchas learn from your selections, how does it know you selected the right choices?

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I saw a video recently that said that captchas learn from the user as a way to train AI, but how does it know that you selected the right option? I’m talking about the captchas that tell you to select all the fire hydrants or traffic lights

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Anonymous 0 Comments

It doesn’t always use the selection you make to verify your humanness. It cat actually tell because a bot will either select completely random answers, not make any selections or make selections in such a quick, predictable patter that no human will act like that.

Plus, these usually prevent repeat access from robots so if 1 in 3 have known answers then most robots that can beat the rest of the captcha can only access 3 times before it is stopped.

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